perf: Handle stopped state with tracepoints

[karo-tx-linux.git] / kernel / perf_event.c

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 2870feee81dd7a046703645c9ec50022d4339f39..ee489d0847fe2fba89a1361808e15c563ac2a073 100644 (file)
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -652,6 +652,10 @@ retry:
        raw_spin_unlock_irq(&ctx->lock);
 }
 
+#define MAX_INTERRUPTS (~0ULL)
+
+static void perf_log_throttle(struct perf_event *event, int enable);
+
 static int
 event_sched_in(struct perf_event *event,
                 struct perf_cpu_context *cpuctx,
@@ -662,6 +666,17 @@ event_sched_in(struct perf_event *event,
 
        event->state = PERF_EVENT_STATE_ACTIVE;
        event->oncpu = smp_processor_id();
+
+       /*
+        * Unthrottle events, since we scheduled we might have missed several
+        * ticks already, also for a heavily scheduling task there is little
+        * guarantee it'll get a tick in a timely manner.
+        */
+       if (unlikely(event->hw.interrupts == MAX_INTERRUPTS)) {
+               perf_log_throttle(event, 1);
+               event->hw.interrupts = 0;
+       }
+
        /*
         * The new state must be visible before we turn it on in the hardware:
         */
@@ -1469,10 +1484,6 @@ void __perf_event_task_sched_in(struct task_struct *task)
        }
 }
 
-#define MAX_INTERRUPTS (~0ULL)
-
-static void perf_log_throttle(struct perf_event *event, int enable);
-
 static u64 perf_calculate_period(struct perf_event *event, u64 nsec, u64 count)
 {
        u64 frequency = event->attr.sample_freq;
@@ -1872,8 +1883,7 @@ static int alloc_callchain_buffers(void)
         * accessed from NMI. Use a temporary manual per cpu allocation
         * until that gets sorted out.
         */
-       size = sizeof(*entries) + sizeof(struct perf_callchain_entry *) *
-               num_possible_cpus();
+       size = offsetof(struct callchain_cpus_entries, cpu_entries[nr_cpu_ids]);
 
        entries = kzalloc(size, GFP_KERNEL);
        if (!entries)
@@ -2101,14 +2111,11 @@ find_get_context(struct pmu *pmu, struct task_struct *task, int cpu)
        unsigned long flags;
        int ctxn, err;
 
-       if (!task && cpu != -1) {
+       if (!task) {
                /* Must be root to operate on a CPU event: */
                if (perf_paranoid_cpu() && !capable(CAP_SYS_ADMIN))
                        return ERR_PTR(-EACCES);
 
-               if (cpu < 0 || cpu >= nr_cpumask_bits)
-                       return ERR_PTR(-EINVAL);
-
                /*
                 * We could be clever and allow to attach a event to an
                 * offline CPU and activate it when the CPU comes up, but
@@ -4407,7 +4414,7 @@ static int perf_exclude_event(struct perf_event *event,
                              struct pt_regs *regs)
 {
        if (event->hw.state & PERF_HES_STOPPED)
-               return 0;
+               return 1;
 
        if (regs) {
                if (event->attr.exclude_user && user_mode(regs))
@@ -4763,6 +4770,8 @@ static int perf_tp_event_match(struct perf_event *event,
                                struct perf_sample_data *data,
                                struct pt_regs *regs)
 {
+       if (event->hw.state & PERF_HES_STOPPED)
+               return 0;
        /*
         * All tracepoints are from kernel-space.
         */
@@ -5305,6 +5314,11 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
        struct hw_perf_event *hwc;
        long err;
 
+       if ((unsigned)cpu >= nr_cpu_ids) {
+               if (!task || cpu != -1)
+                       return ERR_PTR(-EINVAL);
+       }
+
        event = kzalloc(sizeof(*event), GFP_KERNEL);
        if (!event)
                return ERR_PTR(-ENOMEM);
@@ -5353,7 +5367,7 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
 
        if (!overflow_handler && parent_event)
                overflow_handler = parent_event->overflow_handler;
-       
+
        event->overflow_handler = overflow_handler;
 
        if (attr->disabled)